Episode 145: Switching Things Up, Metabolic Flexibility, Over-Restricting, and More
Digest
This episode of Fast Feast Repeat delves into intermittent fasting (IF) for life, emphasizing education, motivation, and fun. Hosts Jen Stevens and Sherri Bullock share personal updates and a listener success story, highlighting how to integrate IF with life's events like holidays and workouts. Key concepts discussed include achieving fat adaptation for easier window flexing, understanding energy and fat burning, and the importance of average eating window length. The podcast addresses listener questions on managing workouts and weekends, the impact of alcohol on fasting, and strategies for experienced fasters facing plateaus. It also clarifies advice for underweight and pre-diabetic individuals, emphasizing nutrient-dense foods over IF. Further discussions cover perimenopause-related stalls, the metabolic \"switch\" to fat burning, and the nuances of over-restriction versus body recomposition. The episode concludes with insights on calorie intake, longevity research, a mascara recommendation, and a mindset shift from "I'm hungry" to "I'm healing."
Outlines

Introduction to Intermittent Fasting and Personal Updates
Hosts Jen and Sherri introduce the Fast Feast Repeat podcast, focusing on intermittent fasting for life. They share personal updates, including Sherri's recovery from an injury and Jen's weekend trip, emphasizing the importance of balancing life events with fasting habits.

Listener Success and Navigating Life Events with IF
A listener shares her four-month IF success, losing 15 pounds and overcoming challenges. The hosts discuss that there's no perfect time to start IF and the need to flex fasting windows to accommodate life's events without abandoning the practice.

The Science of Fat Adaptation and Energy
Achieving fat adaptation is crucial for flexible fasting. The discussion explores why some don't experience expected energy benefits, often due to inconsistent or overly long eating windows, preventing consistent fat burning. Jen shares her successful weight loss attributed to a consistent average eating window.

Understanding Fasting Nuances and Listener Challenges
The podcast clarifies that "switching things up" involves nutrient variability, not just window length. Listener Donna seeks advice on integrating workouts and looser weekend windows. The hosts discuss how alcohol impacts fasting and suggest tightening windows and adjusting workout timing.

Balancing Lifestyle, Goals, and Listening to Your Body
Experienced fasters often manage endurance workouts well. The key is balancing lifestyle with goals, understanding that achieving specific goals may require compromises. Listening to your body's signals is crucial for recognizing the shift into fat burning.

Addressing Underweight, Pre-diabetes, and Muscle Mass
Lynn, underweight and pre-diabetic, is advised against IF. The focus shifts to nutrient-dense foods and consulting a doctor. The importance of muscle mass for insulin sensitivity is highlighted.

Listener "Why," Perimenopause, and Metabolic Shifts
A listener shares her "why" for IF: freedom from food noise and improved internal health. Kristy, in perimenopause, experiences stalled progress and cloudy-headedness, prompting a discussion on the metabolic "switch" and pushing through discomfort for fat burning.

Plateaus, ADF, and Calorie Intake Considerations
Refocused, experiencing a plateau with ADF, has optimal HOMA IR. The hosts suggest body recomposition and potential over-restriction. Patty questions her one-meal-a-day approach, leading to a discussion on assessing over-restriction, metabolic rate, and Blue Zones' caloric intake.
Keywords
Intermittent Fasting
A dietary pattern that cycles between periods of voluntary fasting and non-fasting. It's not about *what* you eat, but *when* you eat. Popular methods include 16/8, 5:2, and Eat Stop Eat. It can aid in weight loss, improve metabolic health, and enhance cellular repair processes.
Fat Adaptation
The metabolic state where the body becomes efficient at using fat for energy instead of carbohydrates. This is a key goal of intermittent fasting and ketogenic diets, leading to sustained energy levels and improved fat burning capabilities.
Metabolic Flexibility
The body's ability to efficiently switch between using carbohydrates and fats for fuel. This is a crucial aspect of intermittent fasting, allowing the body to adapt to different energy availability and maintain optimal function.
Window Creep
The gradual lengthening of the eating window during intermittent fasting, often unintentionally. This can hinder progress by reducing the overall fasting duration and preventing consistent fat burning.
HOMA IR
Homeostatic Model Assessment of Insulin Resistance. A calculation used to estimate insulin resistance and pancreatic beta-cell function. A lower HOMA IR score (typically below 0.9) indicates better insulin sensitivity.
Body Recomposition
The process of simultaneously losing fat and gaining muscle mass. This is often achieved through a combination of resistance training, proper nutrition, and sometimes intermittent fasting, leading to a leaner, more toned physique.
Over-restriction
Consuming too few calories or fasting for excessively long periods, which can negatively impact metabolism and hormonal balance. This can lead to unintended consequences like metabolic slowdown and difficulty with weight maintenance.
Perimenopause and Fasting
Discusses how hormonal changes during perimenopause can affect weight loss progress and energy levels while intermittent fasting, and strategies to address these challenges.
Alcohol and Fasting
Explains how alcohol consumption can interfere with the body's ability to burn fat and enter ketosis, potentially hindering the benefits of intermittent fasting.
Underweight and Pre-diabetes Advice
Provides guidance for individuals who are underweight or pre-diabetic, emphasizing the importance of adequate nutrition and consulting healthcare professionals, and advising against intermittent fasting in these cases.
Q&A
What is the significance of "fat adaptation" in intermittent fasting?
Fat adaptation is a metabolic state where your body becomes proficient at burning fat for energy instead of relying primarily on carbohydrates. This is a key goal of intermittent fasting, leading to more stable energy levels, reduced cravings, and enhanced fat loss.
How can "window creep" affect intermittent fasting progress?
Window creep is the unintentional lengthening of your eating window over time. This reduces your overall fasting duration, potentially hindering your body's ability to consistently enter a fat-burning state and slowing down progress towards your goals.
What does it mean to "flip the switch" in intermittent fasting?
"Flipping the switch" refers to the metabolic shift your body makes from burning glucose for energy to burning stored fat. This transition typically occurs after a certain fasting period and is associated with increased energy, mental clarity, and reduced hunger.
Why is metabolic flexibility important in intermittent fasting?
Metabolic flexibility allows your body to efficiently switch between using carbohydrates and fats for fuel. This adaptability is crucial for intermittent fasting, enabling your body to access stored fat for energy during fasting periods and utilize glucose when available.
Can intermittent fasting be detrimental for underweight individuals?
Yes, intermittent fasting is generally not recommended for individuals who are underweight. The primary focus should be on adequate nutrition to reach a healthy weight, and fasting could exacerbate weight loss and potential nutrient deficiencies.
What is the difference between "carbs" and "ultra-processed foods"?
While vegetables and fruits are carbohydrates, "carbs" is often colloquially used to refer to ultra-processed foods high in sugar and refined ingredients. It's important to distinguish between nutrient-dense whole food carbs and processed options that can negatively impact health.
How can alcohol consumption affect intermittent fasting results?
Alcohol can interfere with the body's ability to enter a fat-burning state. It can delay ketosis, impact energy levels for workouts, and potentially disrupt the metabolic benefits of fasting, especially if consumed regularly.
What should someone do if they experience cloudy-headedness or hunger during a fast?
This sensation might indicate your body is transitioning to fat burning. Pushing through it for 30-60 minutes, perhaps with a walk, can help your body access stored fat. If the feeling persists or worsens, it's advisable to consult a healthcare professional.
Is it possible to over-restrict calories or fasting time?
Yes, over-restriction can occur by consuming too few calories or fasting for excessively long periods. This can lead to metabolic slowdown and hormonal imbalances. It's important to find a sustainable balance that supports your goals without compromising your health.
How can one determine if they are at their maintenance weight?
Maintenance weight is often indicated by feeling good in your body, having consistent energy levels, maintaining a healthy body composition (including muscle mass), and not having a significant amount of excess body fat to lose. It's a feeling of balance and sustainability.
Show Notes
To make a submission for the podcast, go to fastfeastrepeat.com/submit. We are a community-driven podcast, and we look forward to sharing your questions, success stories, non-scale victories, IF tweaks, motivational quotes (and more!) on each episode of the podcast.
Resources used in today’s episode:
https://www.healthline.com/health/exercise-fitness/ideal-body-fat-percentage#for-women
For more information regarding one-on-one IF support visit: https://www.fastfeastrepeat.com/coaching.html
sheri@fastfeastrepeat.com
https://www.fastfeastrepeat.com/sheri.html
https://crunchi.com/?als=SheriBullock
https://www.counter.com/?aff=SHERIBULLOCK
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